US 12,119,494 B2
Positive electrode active substance for lithium ion secondary battery and lithium ion secondary battery
Hiroaki Kawamura, Otsu (JP); and Tomoya Onozuka, Otsu (JP)
Assigned to TORAY INDUSTRIES, INC., Tokyo (JP)
Appl. No. 17/792,880
Filed by TORAY INDUSTRIES, INC., Tokyo (JP)
PCT Filed Dec. 23, 2020, PCT No. PCT/JP2020/048111
§ 371(c)(1), (2) Date Jul. 14, 2022,
PCT Pub. No. WO2021/153110, PCT Pub. Date Aug. 5, 2021.
Claims priority of application No. 2020-013245 (JP), filed on Jan. 30, 2020; and application No. 2020-013246 (JP), filed on Jan. 30, 2020.
Prior Publication US 2023/0072041 A1, Mar. 9, 2023
Int. Cl. H01M 4/58 (2010.01); C01B 25/45 (2006.01); H01M 4/36 (2006.01); H01M 4/587 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/5825 (2013.01) [C01B 25/45 (2013.01); H01M 4/366 (2013.01); H01M 4/587 (2013.01); C01P 2002/50 (2013.01); C01P 2002/74 (2013.01); C01P 2004/61 (2013.01); C01P 2004/62 (2013.01); C01P 2004/64 (2013.01); C01P 2004/80 (2013.01); C01P 2006/12 (2013.01); C01P 2006/14 (2013.01); C01P 2006/16 (2013.01); C01P 2006/40 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 12 Claims
 
1. A positive electrode active material for a lithium ion secondary battery, which comprises a granulated body of positive electrode active material particles for a lithium ion secondary battery, wherein an average particle diameter of primary particles is 10 nm or more and 80 nm or less, and a number ratio of particles having a particle diameter of 100 nm or more is 1.2% or higher and 5.0% or less.